The first photosynthetic autotrophs used the energy of the sun to split H₂O because it is not very electronegative.

Name: The first photosynthetic autotrophs used the energy of the sun to split H 2 O because it is not very electronegative.
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The first photosynthetic autotrophs used the energy of the sun to split water (H2O), not H₂O, because water was abundant and provided a source of electrons for the reduction of CO2 to organic compounds.

The First Photosynthetic Autotrophs Used the Energy of the Sun